﻿using System;
using AppToolkit.WPF.Utils.XamlToHtmlParser;
using System.Windows.Data;

namespace AppToolkit.WPF.Controls.Utils
{
    /// <summary>
    /// Converts between Xaml and Html.
    /// </summary>
    [ValueConversion(typeof(string), typeof(string))]
    public class HtmlXamlConverter : IValueConverter
    {
        #region IValueConverter Members

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value produced by the binding source.</param><param name="targetType">The type of the binding target property.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var text = value as string;
            if (!string.IsNullOrEmpty(text))
            {
                return HtmlToXamlConverter.ConvertHtmlToXaml(text, false);
            }
            return string.Empty;
        }

        /// <summary>
        /// Converts a value. 
        /// </summary>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        /// <param name="value">The value that is produced by the binding target.</param><param name="targetType">The type to convert to.</param><param name="parameter">The converter parameter to use.</param><param name="culture">The culture to use in the converter.</param>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            var xamlText = value as string;
            if (!string.IsNullOrEmpty(xamlText))
            {
                return HtmlFromXamlConverter.ConvertXamlToHtml(xamlText, false);
            }
            return string.Empty;
        }
        #endregion
    }
}
